<template>
    <div>
        <!-- 面包屑区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!--- 卡片区域 --->
        <el-card>
            <!-- 警示框 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>

            <!-- 进度条 --->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 --->
            

            <!-- 表单 --->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">

                    <!-- 商品名称面板 --->
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="">
                            <el-cascader
                            expand-trigger='hover'
                            v-model="addForm.goods_cat"
                            :options="cataList"
                            :props="cateProps"
                            @change="handleChange" clearable></el-cascader>
                        </el-form-item>
                    </el-tab-pane>

                    <!-- 商品参数面板 --->
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 --->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>

                    <!-- 商品属性面板 --->
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>

                    <!-- 商品图片面板 --->
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action图片要上传的图片的后台Api地址 --->
                        <el-upload :headers="headerObj" :on-success="handleSuccess" :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>

                    <!-- 商品内容面板 --->
                    <el-tab-pane label="商品内容" name="4">
                        <!--- 富文本编辑器 --->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品 -->
                        <el-button class="btnAdd" type="primary" @click="add">添加商品</el-button>
                    </el-tab-pane>

                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 --->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="25%">
            <img :src="previewPath" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数据
                goods_cat: [],
                // 图片上传临时路径数组
                pics: [],
                // 商品介绍
                goods_introduce: '',
                attrs: []
            },
            // 添加商品的表单数据验证规则
            addFormRules: {
                goods_name: [
                    {required: true, message: '请输入商品名称', trigger: 'blur'}
                ],
                goods_price: [
                    {required: true, message: '请输入商品价格', trigger: 'blur'}
                ],
                goods_weight: [
                    {required: true, message: '请输入商品重量', trigger: 'blur'}
                ],
                goods_number: [
                    {required: true, message: '请输入商品数量', trigger: 'blur'}
                ],
                goods_cat: [
                    {required: true, message: '请选择商品分类', trigger: 'blur'}
                ]
            },
            // 商品分类列表
            cataList: [],
            // 
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData: [],
            // 上传图片的url地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers 请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            // 预览图片路径
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类数据
        async getCateList() {
            const { data: res } = await this.$http.get('categories')

            if(res.meta.status !== 200) {
                return this.$message.error('获取商品数据分类失败！')
            }

            this.cataList = res.data
            this.$message.success('获取商品数据分类成功！')
        },
        // 级联选择器变化选择参数
        handleChange() {
            if(this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        // 
        beforeTabLeave(activeName, oldActiveName) {
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类！')
                return false
            }
        },
        // tab栏点击事件
        async tabClicked() {
            // 访问动态参数面板
            if(this.activeIndex === '1') {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: {sel: 'many'} })

                if (res.meta.status !== 200) {
                    return this.$message.error('获取数据失败！')
                }
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                
                this.manyTableData = res.data
            } else if (this.activeIndex === '2') {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: {sel: 'only'} })

                if (res.meta.status !== 200) {
                    return this.$message.error('获取数据失败！')
                }

                this.onlyTableData = res.data;
            }
        },
        // 处理图片预览的函数
        handlePreview(file) {
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理图片取消上传的函数
        handleRemove(file) {
            // 1. 获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2. 从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3. 调用数组的splice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i, 1)
        },
        // 监听图片上传
        handleSuccess(response) {
            // 1. 拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path }
            // 2. 将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
        },
        // 添加商品
        add() {
            // 表单校验
            this.$refs.addFormRef.validate(async valid => {
                // 校验失败
                if(!valid) {
                    return this.$message.error('请添加必要的表单项')
                }
                // 校验成功
                // 执行添加业务
                // lodash cloneDeep(obj)深拷贝
                
                const form = _.cloneDeep(this.addForm)
                form.goods_cat =  form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
                    this.addForm.attrs.push(newInfo)
                })

                form.attrs = this.addForm.attrs

                // 发起请求添加商品
                // 
                const { data: res } = await this.$http.post('goods', form)

                if(res.meta.status !== 201) {
                    return this.$message.error('添加商品失败！')
                }
                
                this.$router.push('/goods')
            })
        }

    },
    computed: {
        // 监听id
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        },
        
    },
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 0.8em 0 0 !important;
}

.previewImg {
    width: 100%;
}

.btnAdd {
    margin-top: 2em;
}
</style>